Diesel vs petrol: what’s worth it?
One simple truth: it depends on your driving pattern. For a direct comparison, use cost per 100 km (consumption × price) — and if you want it clean: cost per km including fixed costs.
Calculate & compare:
What you should compare
- Cost per 100 km: consumption × price (best quick metric)
- Cost per km: cost per 100 km ÷ 100
- Fixed costs: insurance/tax/maintenance (optional for “cost per km”)
Jump to the formula: Fuel cost per 100 km.
Rules of thumb (no wishful thinking)
- Lots of motorway/long-distance: diesel is often ahead (lower consumption)
- Lots of short trips/city driving: petrol is often simpler and more predictable
- Decisive: your real consumption + current price
Example: comparing via cost per 100 km
Assumptions (example only):
- Diesel: 5.5 L/100 km at 1.75 €/L → 9.63 €/100 km
- Petrol: 6.8 L/100 km at 1.85 €/L → 12.58 €/100 km
For a real decision, “cost per km” can help: Calculate cost per km.
FAQ
When does diesel make sense?
Often with lots of long-distance driving/high annual mileage — check cost per 100 km.
What’s the best way to compare?
Cost per 100 km (consumption×price) and optionally cost per km including fixed costs.